Correcting GUT MicrobioTa by Combined Supplementation of FibERs and BIotiN to Improve Microbiome and Optimize Bariatric Surgery Outcomes (GUTERRING)

Bariatric surgery improves health outcomes with a maximal weight loss on average occurring 1 year after surgery but with dramatic between-subjects variability in weight loss (ranging from 20 to 160% excess weight loss) for reasons that remain to be elucidated.

The investigators hypothesize that targeting the 3 months pre-surgery period by a calibrated dietary intervention, with fiber enrichment and biotin, will improve gut microbiota richness and subsequently improve subjects' metabolic health that may optimize post bariatric surgery outcomes.

The study is designed as a pilot, comparative, randomized, open-label trial with 4 arms: standard of care, biotin only, fibers only, biotin + fibers.

Study Overview

• Status: Terminated
• Conditions: Metabolic Syndrome; Severe Obesity
• Intervention / Treatment: Other: Standard of care; Dietary supplement: Biotin supplement; Dietary supplement: Fiber supplement

Detailed Description

This is a pilot open label study that aims to examine the efficacy of biotin supplementation with or without enriched soluble and insoluble fibers given during 3 months before the bariatric surgery, on gut microbiota composition and functional capacity to produce B vitamins (primary outcomes), compared to standard of care (e.g. patient preparation to bariatric surgery).

The study is a 4-arm clinical trial:

Arm 1: patients with usual follow-up (standard of care) receiving during 3 months before the surgery usual general dietary recommendations regarding balanced diet comprising legumes and fruits, meat or equivalent, dairy products and starch and bread Arm 2: Same usual general dietary recommendations PLUS Biotin 450 µg per day (1 capsule per day) during 3 months before the surgery.

Arm 3: Same usual general dietary recommendations PLUS 3 servings per day of PureLean® Fiber, a powdered blend of fibers and prebiotics, during 3 months before the surgery Arm 4: Same usual general dietary recommendations PLUS 3 servings per day of PureLean® Fiber and Biotin 450 µg per day (1 capsule per day), during 3 months before the surgery.

There will be two periods: period 1 during the 3 months before bariatric surgery and period 3 after bariatric surgery (usual standard of care follow-up). The 4 groups will be compared before bariatric surgery and up to 6 months afterward

Patients will receive a schedule of hospitalizations and visits before and after the surgery:

• V0: 3 months before surgery
• V1: presurgery visit, one day hospitalization
• V2: 3 months post-surgery
• V3: 6 months post-surgery
• V4:12 months post-surgery

At each visit (V0, V1, V2 , V3 and V4), will be performed as part of research:

• Adipose tissue aspiration
• Questionnaires
• Fecal samples
• Saliva samples (oral microbiota)
• Blood samples
• Urine samples This planning is part of the standard of care. The same follow-up will be performed in the 4 arms.

Patients will be called 3 times between V0 and V1 by dietician as part of research.

• Study Type: Interventional
• Enrollment (Actual): 5
• Phase: Not Applicable

Contacts and Locations

Study Locations

• France
  • Paris, France, 75013
    • Hôpital Pitie Salpétrière

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Age ≥ 18 years and < 60 years
2. BMI ≥ 40 kg/m² or BMI > 35 kg/m² with at least one comorbidity belonging to metabolic syndrome (hyperglycemia (fasting glycemia > 1g/l, Non diabetic with HbA1C<7% without antidiabetic treatment), dyslipidemia (HDL-cholesterol <0.5 g/l or receiving treatment against dyslipidemia), or increased blood pressure (SBP >13, DBP>9 or treated by antihypertensive drug)), or sleep apnoea, weight stable (less than 3 kg variation in the 2 months before
3. Usual Fiber intake < 20g/day in food consumption evaluated by 24h recall
4. Signature of the informed consent
5. Effective contraception in women of childbearing age
6. Subject with health insurance (except AME)

Exclusion Criteria:

1. Patients receiving antibiotics (ATB) at the selection time or within the 2 previous months.

   (if agreeing to participate to the study, the patients will be proposed randomization 3 months after stopping ATB)

2. Type 1 or type 2 diabetes
3. HIV, HBV, HCV
4. Gastrointestinal disease: Acute or chronic diarrhea (i.e. more than 3 liquid or fluid stools/day)
5. Previous history of gastrointestinal neoplasia or polyps
6. Factors that may affect the composition of the intestinal microbiota: Special Diet (exclusion diet, vegetarian diet), taking immunosuppressants (eg calcineurin inhibitors, corticosteroids, biological agents, etc.), taking transit modulators (osmotic or prebiotics such as lactulose).
7. Pregnancy or breastfeeding women
8. Subject under guardianship or curatorship
9. Subject deprived of their liberty by a judicial or administrative decision
10. Patient participating to another interventional clinical research (Jardé 1)
11. Subject physically unable to give his or her written consent

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

4

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Arm 1: patient with usual follow-up (standard of care); receiving during 3 months before the surgery usual general dietary recommendations regarding balanced diet comprising legumes and fruits, meat or equivalent, dairy products and starch and bread	Other: Standard of care; Patients receiving during 3 months before the surgery usual general dietary recommendations regarding balanced diet comprising legumes and fruits, meat or equivalent, dairy products and starch and bread
Experimental: Arm 2: Same usual general dietary recommendations PLUS Biotin; Patients will receive the same usual general dietary recommendations PLUS 1 capsule per day of Biotin 450 µg per day during 3 months before the surgery.	Other: Standard of care; Patients receiving during 3 months before the surgery usual general dietary recommendations regarding balanced diet comprising legumes and fruits, meat or equivalent, dairy products and starch and bread; Dietary supplement: Biotin supplement; 1 capsule per day of Biotin 450µg during 3 months before the surgery.
Experimental: Arm 3: Same usual general dietary recommendations PLUS Fiber; Patients will receive the same usual general dietary recommendations PLUS 3 servings per day of PureLean® Fiber, a powdered blend of fibers and prebiotics, during 3 months before the surgery	Other: Standard of care; Patients receiving during 3 months before the surgery usual general dietary recommendations regarding balanced diet comprising legumes and fruits, meat or equivalent, dairy products and starch and bread; Dietary supplement: Fiber supplement; 3 servings per day of PureLean® Fiber, a powdered blend of fibers and prebiotics, during 3 months before the surgery
Experimental: Arm 4: Same usual general dietary recommendations PLUS Fiber PLUS Biotin; Patients will receive the same usual general dietary recommendations PLUS 3 servings per day of PureLean® Fiber and Biotin 450 µg per day (1 capsule per day), during 3 months before the surgery.	Other: Standard of care; Patients receiving during 3 months before the surgery usual general dietary recommendations regarding balanced diet comprising legumes and fruits, meat or equivalent, dairy products and starch and bread; Dietary supplement: Biotin supplement; 1 capsule per day of Biotin 450µg during 3 months before the surgery.; Dietary supplement: Fiber supplement; 3 servings per day of PureLean® Fiber, a powdered blend of fibers and prebiotics, during 3 months before the surgery

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
3-month variation of gut microbiota richness 3 months after the start of the different dietary interventions	Access to gut microbiota richness will be provided after gut microbiota sequencing (by INRAE) with the acquisition of a table comprising the number of genes as well as the record of bacterial genes implicated in synthesis and transport of biotin. Based on preclinical observation, it is expected that the arm 4 combining biotin and fibers will show the highest richness	At the inclusion and 3 months after supplementation

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Assess changes in body weight between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery.	Body Weight will be obtained at each visit between 8 and 10 am using standardized procedures: Body weight will be obtained with a scale (Seca GmbH & Co., Hamburg, Germany) in kilograms	At the inclusion, 3months after supplementation, 3, 6 and 12 months after surgery
Assess changes in BMI between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery	Height will be obtained with measuring scale rounded to the nearest 0.5 cm in centimeters Weight and height will be combined to report BMI in kg/m^2	At the inclusion, 3months after supplementation, 3, 6 and 12 months after surgery
Assess changes in waist circumference between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery	Twaist circumference will be measured in centimeters at the level of the iliac crest and hip circumference at the level of the symphysis-great trochanter to the nearest 1 cm.	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in fat mass between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery	For the measurement of fat mass (in kilograms and percentage of body weight), patients will undergo DEXA analysis, using the Hologic Inc. machine, QDR 4500W t using standard software (Hologic Inc., S/N 47168 VER. 11.2)	At the inclusion, 3 month after supplementation, 3, 6 and 12 months after surgery
Assess changes in lean mass between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery	For the measurement of lean mass (in kilograms and percentage of body weight), patients will undergo DEXA analysis, using the Hologic Inc. machine, QDR 4500W t using standard software (Hologic Inc., S/N 47168 VER. 11.2)	At the inclusion, 3 month after supplementation, 3, 6 and 12 months after surgery
Assess changes in visceral adipose tissue mass between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery	For the measurement of visceral adipose tissue mass (in kilograms and percentage of body weight), patients will undergo DEXA analysis, using the Hologic Inc. machine, QDR 4500W t using standard software (Hologic Inc., S/N 47168 VER. 11.2)	At the inclusion, 3 month after supplementation, 3, 6 and 12 months after surgery
Assess changes in blood pressure between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery.	Blood pressure (Systolic and Diastolic) will be measured three times with a mercury sphygmomanometer in the right arm, with patients in a sitting position after five minutes of rest. The average of the three measurements will be considered for analysis	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in insulin resistance markers between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery.	To predict insulin resistance, homeostatic model assessment of insulin resistance (HOMA-IR) will be calculated according to the following formula: HOMA-IR = [fasting insulin (mU/l) x fasting blood glucose (mmol/l)]/22.5.	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in insulin sensitivity markers between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery	Quantitative insulin sensitivity check index (QUICKI) will be calculated according to the following formula: QUICKI= 1/[log(fasting insulin) + log(fasting blood glucose)	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess change in Leptin between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery.	Leptin (ng/mL) will be measured according to standard protocols using human Leptin ELISA Kit (MyBioSource, Cod. MBS9425103)	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess change in Adiponectin between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery.	Adiponectin (µg/mL) will be measured according to standard protocols using human Adiponectin /Acrp30 Quantikine ELISA kit (DRP300, R&D Systems)	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in glucose between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery	A fasting venous blood draw will be taken from a vein on the forearm to verify blood glucose (g/L) using commercial kits	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in lipid profile between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery	A fasting venous blood draw will be taken from a vein on the forearm to verify triglycerides ( g/L), total cholesterol (g/L), HDL- cholesterol(g/L), LDL- cholesterol (g/L), using commercial kits	At the inclusion, 3months after supplementation, 3, 6 and 12 months after surgery
Assess changes in liver function between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery	A fasting venous blood draw will be taken from a vein on the forearm to verify alanine aminotransferase (ALT) (UI/L), aspartate aminotransferase (AST) (UI/L), gamma-glutamyl transferase (GGT) (UI/L), using commercial kits	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess change in inflammatory marker (C-reactive protein) between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery.	C-reactive protein (mg/l) will be measured by multiplex analysis	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in inflammatory markers (IL6, sCD14, IL1b, IL10, TNF-R) between the visit 3 months before surgery and the pre-surgery visit, the visit at 3 and 6 months after surgery.	IL6, sCD14, IL1b, IL10, TNF-R (pg/mL) will be measured by multiplex analysis	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in adipose tissue gene expression for biotin-dependent carboxylases and inflammatory genes	Adipose tissue aspiration (100 mg): measure for adipose cell size and gene expression study (5-carboxylase depending of biotin and inflammatory markers).	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in quality of life	Information regarding their usual lifestyle by autoquestionnaire: SF-36 (Medical Outcome Study Short Form - 36) ranging from 0 to 100. A low score reflects a perception of poor health, loss of function, presence of pain. A high score reflects a perception of good health, an absence of functional deficit and pain	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in emotional eating	Information regarding their usual lifestyle by autoquestionnaire : Dutch Eating Behaviour Questionaire ( DEBQ) : this questionnaire is composed by 33 items divided into 3 scores. Of the original 100 items, 33 will be maintained and divided into 3 scores. Each question allows for 5 possible answers rated from 0 to 5 points. The possible answers are: never (1 point), rarely (2 points), sometimes (3 points), often (4 points), very often (5 points). The scores are as follows: Restriction score: 10 questions on the "organised" will to control one's weight.; Emotionality score: 13 questions divided into two sub-scores, diffuse emotionality for 4 questions and definite emotionality for 9 questions; Externality score: 10 questions For each score, if the average of the responses is higher than 30, the subject is considered respectively: restricted, emotional eating or external.	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in physical activity	Information regarding their usual lifestyle by autoquestionnaire : Recent Physical Activity Questionnaire ( RPAQ) : Interpretation of the physical activity (PA) level : Total sum week + weekend :; <8.3 MET.h/week: inactive ;; From 8.3 MET.h/week: active, with the possibility of two levels:From 8.3 to 16.7: moderate PA;>16.7: high PA.; interpretation of the time spent inactive : For weekdays and weekends:; ≤7h/d: non-sedentary ;; >7h/d: sedentary.	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in anxiety	Information regarding their usual lifestyle by autoquestionnaire : HAD questionnaire (Hospital Anxiety and Depression questionnaire) : the HAD scale is an instrument to screen for anxiety and depressive disorders. It consists of 14 items rated from 0 to 3. Seven questions relate to anxiety (total A) and seven others to the depressive dimension (total D). (total D), thus allowing two scores to be obtained (maximum score for each score = 21). For each of the scores (A and D): 7 or less: no symptomatology; 8 to 10: doubtful symptomatology; 11 and more: definite symptomatology.	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in sleep quality	Information regarding their usual lifestyle by autoquestionnaire : STOP band (Snoring - Tired - Observed apnea - Pressure - BMI - Age - Neck size - Gender) questionnaire: Interpretation of the STOP-BANG: The STOP-BANG score can be used to identify subjects at risk of sleep apnea (S.A.).; Low risk of S.A.: Score from 0 to 2.; Moderate risk of S.A.: Score of 3 to 4.; High risk of S.A.: Score of 5 to 8, or STOP ≥ 2 and male sex, or STOP ≥ 2 and BMI > 35, or STOP ≥ 2 and neck circumference > 40cm.	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in stool consistency	Patients will be asked to answer a Bristol stool scale : the Bristol Scale has seven types of profiles, ranging from constipation (type 1 and 2) to diarrhea (type 6 and 7). Each type corresponds to a specific description of the stool.	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Assess changes in stool inflammatory markers	Fecal calprotectin (in µg/g of feces) will be measured through ELISA kit	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Change in gut microbiota composition by quantitative metagenomics.	Total fecal DNA will be extracted, sequenced by oxford nanopores technology and analysed using momr R package.	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Change in intestinal permeability by Zonuline dosage	Zonuline dosage (ng/mL)	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Change in intestinal permeability by LPS-binding protein dosage	LPS-binding protein dosage (mg/L)	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Systemic measurement of Biotin (B8),B6 and B9-vitamins	Biotin (B8),B6 and B9 (nmol/L) will be measured by Elisa dosage from blood samples	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery
Systemic measurement of B12-vitamin	B12 (pmol/L) will be measured by Elisa dosage from blood samples	At the inclusion, 3 months after supplementation, 3, 6 and 12 months after surgery

Collaborators and Investigators

• Sponsor: Assistance Publique - Hôpitaux de Paris

Study record dates

Study Major Dates

• Study Start (Actual): July 24, 2023
• Primary Completion (Actual): December 24, 2024
• Study Completion (Actual): December 24, 2024

Study Registration Dates

• First Submitted: February 10, 2023
• First Submitted That Met QC Criteria: April 14, 2023
• First Posted (Actual): April 27, 2023

Study Record Updates

• Last Update Posted (Actual): March 25, 2025
• Last Update Submitted That Met QC Criteria: January 14, 2025
• Last Verified: January 1, 2025

More Information

Terms related to this study

• Keywords: Microbiome; Supplementation; Bariatric surgery; Biotin; Fibers; GUT microbioTa
• Additional Relevant MeSH Terms: Nutrition Disorders; Metabolic Diseases; Overnutrition; Body Weight; Glucose Metabolism Disorders; Insulin Resistance; Hyperinsulinism; Overweight; Obesity; Metabolic Syndrome; Obesity, Morbid; Physiological Effects of Drugs; Micronutrients; Vitamin B Complex; Vitamins; Biotin
• Other Study ID Numbers: APHP220972; 2022-A02251-42 (Other Identifier: IDRCB)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No